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In the case of Pornhub, Proofpoint said users were shown fake adverts urging them to click to download a new version or Flash update to their web browser - but would instead infect their computers.

Pornhub has not commented on the incident.

If you watch pornography on your laptop you may soon find yourself facing a compulsory age check (Image: PA)

What do the experts say?

Proofpoint warned that this technique of tricking users into clicking on fake adverts and infecting themselves was effective, and had the potential to reach "millions of web surfers" if used elsewhere.

What to do next?

It would be an ideal time to ensure that you are protected in the future. There are a number of sites offering security for PC's, with Bitdefender currently offering £25 off their latest package.

Norton also has up to 64 per cent off their antivirus packages, so it might be a worthwhile investment.